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Annotation of coherent/d/kernel/USRSRC/coh/clist.c, revision 1.1

1.1     ! root        1: /* $Header: /newbits/kernel/USRSRC/coh/RCS/clist.c,v 1.4 91/07/24 07:50:03 bin Exp Locker: bin $ */
        !             2: /* (lgl-
        !             3:  *     The information contained herein is a trade secret of Mark Williams
        !             4:  *     Company, and  is confidential information.  It is provided  under a
        !             5:  *     license agreement,  and may be  copied or disclosed  only under the
        !             6:  *     terms of  that agreement.  Any  reproduction or disclosure  of this
        !             7:  *     material without the express written authorization of Mark Williams
        !             8:  *     Company or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     COHERENT Version 2.3.37
        !            11:  *     Copyright (c) 1982, 1983, 1984.
        !            12:  *     An unpublished work by Mark Williams Company, Chicago.
        !            13:  *     All rights reserved.
        !            14:  -lgl) */
        !            15: /*
        !            16:  * Coherent.
        !            17:  * Character list management.
        !            18:  *
        !            19:  * $Log:       clist.c,v $
        !            20:  * Revision 1.4  91/07/24  07:50:03  bin
        !            21:  * update prov by hal
        !            22:  * 
        !            23:  * 
        !            24:  * Revision 1.1        88/03/24  16:13:33      src
        !            25:  * Initial revision
        !            26:  * 
        !            27:  */
        !            28: #include <sys/coherent.h>
        !            29: #include <clist.h>
        !            30: #include <sched.h>
        !            31: 
        !            32: /*
        !            33:  * Initialise character list queues.
        !            34:  */
        !            35: cltinit()
        !            36: {
        !            37:        register cmap_t cm;
        !            38:        register cmap_t lm;
        !            39:        register paddr_t p;
        !            40:        register int s;
        !            41:        cold_t om;
        !            42: 
        !            43:        s = sphi();
        !            44:        csave(om);
        !            45:        lm = 0;
        !            46:        for (p = clistp+NCLIST*sizeof(CLIST); (p-=sizeof(CLIST)) >= clistp; ) {
        !            47:                cm = cconv(p);
        !            48:                cmapv(cm);
        !            49:                cvirt(cm)->cl_fp = lm;
        !            50:                lm = cm;
        !            51:        }
        !            52:        cltfree = lm;
        !            53:        crest(om);
        !            54:        spl(s);
        !            55: }
        !            56: 
        !            57: /*
        !            58:  * Get a character from the given queue.
        !            59:  */
        !            60: getq(cqp)
        !            61: register CQUEUE *cqp;
        !            62: {
        !            63:        register cmap_t op;
        !            64:        register cmap_t np;
        !            65:        register int ox;
        !            66:        register int c;
        !            67:        register int s;
        !            68:        cold_t om;
        !            69: 
        !            70:        if (cqp->cq_cc == 0)
        !            71:                return (-1);
        !            72:        s = sphi();
        !            73:        op = cqp->cq_op;
        !            74:        ox = cqp->cq_ox;
        !            75:        csave(om);
        !            76:        cmapv(op);
        !            77:        c = cvirt(op)->cl_ch[ox]&0377;
        !            78:        crest(om);
        !            79:        if (--cqp->cq_cc==0 || ++cqp->cq_ox==NCPCL) {
        !            80:                cqp->cq_ox = 0;
        !            81:                cmapv(op);
        !            82:                np = cvirt(op)->cl_fp;
        !            83:                cvirt(op)->cl_fp = cltfree;
        !            84:                crest(om);
        !            85:                cqp->cq_op = np;
        !            86:                cltfree = op;
        !            87:                if (np == 0) {
        !            88:                        cqp->cq_ip = 0;
        !            89:                        cqp->cq_ix = 0;
        !            90:                }
        !            91:                if (cltwant) {
        !            92:                        cltwant = 0;
        !            93:                        wakeup((char *)&cltwant);
        !            94:                }
        !            95:        }
        !            96:        spl(s);
        !            97:        return (c);
        !            98: }
        !            99: 
        !           100: /*
        !           101:  * Put a character on the given queue.
        !           102:  */
        !           103: putq(cqp, c)
        !           104: register CQUEUE *cqp;
        !           105: {
        !           106:        register cmap_t ip;
        !           107:        register int ix;
        !           108:        register int s;
        !           109:        register cmap_t np;
        !           110:        cold_t om;
        !           111: 
        !           112:        s = sphi();
        !           113:        ip = cqp->cq_ip;
        !           114:        csave(om);
        !           115:        if ((ix=cqp->cq_ix) == 0) {
        !           116:                if ((ip=cltfree) == 0) {
        !           117:                        spl(s);
        !           118:                        return (-1);
        !           119:                }
        !           120:                cmapv(ip);
        !           121:                cltfree = cvirt(ip)->cl_fp;
        !           122:                cvirt(ip)->cl_fp = 0;
        !           123:                crest(om);
        !           124:                if ((np=cqp->cq_ip) == 0)
        !           125:                        cqp->cq_op = ip;
        !           126:                else {
        !           127:                        cmapv(np);
        !           128:                        cvirt(np)->cl_fp = ip;
        !           129:                        crest(om);
        !           130:                }
        !           131:                cqp->cq_ip = ip;
        !           132:        }
        !           133:        cmapv(ip);
        !           134:        cvirt(ip)->cl_ch[ix] = c;
        !           135:        crest(om);
        !           136:        if (++cqp->cq_ix == NCPCL)
        !           137:                cqp->cq_ix = 0;
        !           138:        cqp->cq_cc++;
        !           139:        spl(s);
        !           140:        return (c);
        !           141: }
        !           142: 
        !           143: /*
        !           144:  * Clear a character queue.
        !           145:  */
        !           146: clrq(cqp)
        !           147: register CQUEUE *cqp;
        !           148: {
        !           149:        register int s;
        !           150: 
        !           151:        s = sphi();
        !           152:        while (getq(cqp) >= 0)
        !           153:                ;
        !           154:        spl(s);
        !           155: }
        !           156: 
        !           157: /*
        !           158:  * Wait for more character queues to become available.
        !           159:  */
        !           160: waitq()
        !           161: {
        !           162:        while (cltfree == 0) {
        !           163:                cltwant = 1;
        !           164:                sleep((char *)&cltwant, CVCLIST, IVCLIST, SVCLIST);
        !           165:        }
        !           166: }

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